<template>
  <div class="todo-footer" v-show="total">
      <label>
          <!-- <input type="checkbox" :checked="isAll" @click="checkAll"/> -->
           <input type="checkbox" v-model="isAll"/>
      </label>
      <span>  <span>已完成{{doneToal}}</span> / 全部{{total}} </span>
      <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Obliterate",
  data() {
    return {};
  },
  methods: {
    checkAll(e) {
      // console.log(e.target.checked);
      this.checkAllTodo(e.target.checked);
    },
    clearAll() {
      this.clearAllTodo();
    }
  },
  props: ["todos", "checkAllTodo", "clearAllTodo"],
  computed: {
    isAll: {
      get() {
        return this.doneToal === this.total && this.total > 0;
      },
      set(value) {
        return this.checkAllTodo(value);
      }
    },
    total() {
      return this.todos.length;
    },
    doneToal() {
      // let i=0
      // this.todos.forEach(todo => {
      //   if(todo.done) i++
      // });
      // return this.todos.reduce((pre, current) => {
      //   console.log("@: " + pre + current);
      //   return pre + (current.done ? 1 : 0);
      // }, 0);
      // reduce 数据统计
      return this.todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0);
    }
  }
};
</script>

<style lang="css" scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>